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Segment Information - Schedule of Total Services Revenues for Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jul. 01, 2016 | Jun. 30, 2017 | Jul. 01, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 2,514,751 | $ 2,693,873 | $ 7,368,922 | $ 8,323,570
Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,447,362 | 1,226,234 | 4,071,762 | 4,120,901
Process, Scientific, and Systems Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 132,466 | 387,289 | 533,666 | 838,358
Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,579,828 | 1,613,523 | 4,605,428 | 4,959,259
Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 712,687 | 708,880 | 2,117,160 | 2,404,452
Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 222,236 | 371,470 | 646,334 | 959,859
Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 934,923 | 1,080,350 | 2,763,494 | 3,364,311
Aerospace & Technology |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 585,432 | 667,785 | 1,739,908 | 2,007,440
Aerospace & Technology | Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 317,343 | 35,311 | 799,842 | 502,105
Aerospace & Technology | Process, Scientific, and Systems Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 121,450 | 371,954 | 506,250 | 790,533
Aerospace & Technology | Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 438,793 | 407,265 | 1,306,092 | 1,292,638
Aerospace & Technology | Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 23,228 | 7,278 | 78,005 | 77,464
Aerospace & Technology | Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 123,411 | 253,242 | 355,811 | 637,338
Aerospace & Technology | Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 146,639 | 260,520 | 433,816 | 714,802
Buildings & Infrastructure |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 647,252 | 553,546 | 1,813,111 | 1,696,004
Buildings & Infrastructure | Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 587,543 | 503,336 | 1,633,543 | 1,570,143
Buildings & Infrastructure | Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 587,543 | 503,336 | 1,633,543 | 1,570,143
Buildings & Infrastructure | Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 56,067 | 37,518 | 168,526 | 88,383
Buildings & Infrastructure | Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 3,642 | 12,692 | 11,042 | 37,478
Buildings & Infrastructure | Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 59,709 | 50,210 | 179,568 | 125,861
Industrial |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 681,588 | 705,996 | 2,015,784 | 2,044,652
Industrial | Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 234,670 | 222,263 | 617,970 | 646,543
Industrial | Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 234,670 | 222,263 | 617,970 | 646,543
Industrial | Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 352,002 | 378,289 | 1,118,697 | 1,114,312
Industrial | Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 94,916 | 105,444 | 279,117 | 283,797
Industrial | Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 446,918 | 483,733 | 1,397,814 | 1,398,109
Petroleum & Chemicals |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 600,479 | 766,546 | 1,800,119 | 2,575,474
Petroleum & Chemicals | Project Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 307,806 | 465,324 | 1,020,407 | 1,402,110
Petroleum & Chemicals | Process, Scientific, and Systems Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 11,016 | 15,335 | 27,416 | 47,825
Petroleum & Chemicals | Technical Professional Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 318,822 | 480,659 | 1,047,823 | 1,449,935
Petroleum & Chemicals | Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 281,390 | 285,795 | 751,932 | 1,124,293
Petroleum & Chemicals | Operations and Maintenance ("O&M") |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 267 | 92 | 364 | 1,246
Petroleum & Chemicals | Field Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 281,657 | $ 285,887 | $ 752,296 | $ 1,125,539

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